[tex]\\ \sf\longmapsto f(x)=x+3[/tex]
[tex]\\ \sf\longmapsto f(-2)[/tex]
[tex]\\ \sf\longmapsto -2+3[/tex]
[tex]\\ \sf\longmapsto 1[/tex]
f(-2) = -2 + 3
f(-2) = 3 - 2
f(-2) = 1
